61 lines
951 B
C
61 lines
951 B
C
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/*
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tp-swap.c: TecPro Beispielprogramm
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Kurzbeschreibung: "call by reference / call by value"
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C.Koch | HS-Emden-Leer | 19.12.2010
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*/
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#include <stdio.h>
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int swapRef(int* a, int* b);
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int swapVal(int a, int b);
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int swapMem(int* a, int* b);
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void main(void)
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{
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/* auto -> Stack | static -> Datensegment*/
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static int a,b;
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a = 10; b = 20;
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swapVal(a,b);
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printf("Var \t a =%i \t b= %i \n",a, b);
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swapRef(&a, &b);
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printf("Var \t a =%i \t b= %i \n",a, b);
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swapMem(&a, &b);
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printf("Var \t a =%i \t b= %i \n",a, b);
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}
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int swapRef(int* a, int* b)
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{
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int temp;
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temp = *a;
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*a = *b; *b = temp;
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return temp;
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}
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int swapVal(int a, int b)
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{
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int temp;
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temp = a;
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a = b; b = temp;
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return temp;
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}
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/* Aufgabe: Wie muss die folgende Funktion geändert werden,
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falls die Variablen a und b auf dem Stack liegen und nicht im Datensegment? */
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int swapMem(int* a, int* b)
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{
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int temp;
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temp = *a;
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*a = *(a+1); *(a+1) = temp;
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return temp;
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}
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